Inappropriate management of the complications in critical cases can affect the pacing function and even threaten the patient's life.

Conclusion Biventricular pacing can improve cardiopulmonary function, exercise tolerance and quality of life in patients with congestive heart failure and intraventricular block.

Conclusion: Cardiac permanent pacing can improve heart function of patients with chronic arrhythmia, DDD and AAI modes were better than VVI mode.